Joint for sewer and like pipes.



PATENTED MAY '7, 1907.

A. G. BRANDRAM. JOINT FOR SEWER AND LIKE PIPES APPLICATION FILED DBO.22, 1906.

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ANDREW GEORGE BRANDRAM, OF SOUTHSEA, ENGLAND.

JOINT FOR SEWER AND LIKE PIPES.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed December 22,1906- Serial No. 349,103.

To all whom it wea concern:

Be it known that 1, ANDREW GEORGE BRANDRAM, a subject of the King ofGreat Britain, residing at Southsea, England, have invented certain newand useful Improvements in Joints for Sewer and Like Pipes, of which thefollowing is a specification.

This invention relates to improvements in joints for sewer and likepipes and it has for its object to provide a durable and watertightconnection for stoneware, earthenware, concrete or metal pipes-or tubes.

The joint is non-rigid, that is to say, of such nature that in the eventof a slight subsidence of the ground after the pipes have been laid, itwill yield sufficiently to permit the pipes to be deflected and the linethereof to correspond more or less with the contour of the surfacesupporting them, at the same time remaining water-tight.

The invention is applicable to pipes with butt ends, or with rabbetedends, or with any form of end that does not involve a projection on theexterior surface of the barrel, and it does not otherwise require aspecial form of end thus enabling a cheap form of pipe to be used. Italso effects a saving of time and labor in making the joints for layinga line of pipes.

The invention consists essentially in the employment of. a practicallycontinuous fiat band of metal-nearly as long as the externalcircumference of the pipes and surrounding the ends of the pipes attheir junction and which prior to its application thereto is coated withheated bitumen.

A bridge piece or plate of metal also coated with bitumen is placedbeneath the ends of the band, and the band is then drawn tightly roundthe pipes so that a considerable pressure is exerted upon the bitumen;the ends of the band being secured together a perfectly watertightjointresults, which as aforesaid permits of considerable deflection uponthe part of the pipes without causing leakage.

I may employ in conjunction with the metal plate and band a wrapping ofcanvas or other material saturated with heated bitumen encircling thepipes and placed within the said band. If desired the outer peripheriesof the adjacent ends of the pipes may also receive a coating of bitumen.

As another means of preventing the entry of the heated bitumen to theinterior of the pipes, I may employ a padded drum or other pipes aresurrounded by device introduced into the pipes and located at the jointto exclude the bitumen from the bore of the pipe, while at the same timepermitting it to enter the interstices between the ends of the pipes.

In the drawings appendedFigure 1 is a planshowing a joint constructed inaccordance with the present invention. Fig. 2 is a section taken at thepoint of juncture of two pipes. Fig. 3 illustrates a stage in theformajj tion of the joint.

In these drawings, a a indicate the adjacent ends of two pipes, and bthe bitumen. In practice the bitumen is broken down with a suitablequantity of asphalt or other oil varying in accordance with thetemperature of the atmosphere or local conditions at the time of makingthe joint; for example, the quantity of oil employed would be greater inthe winter than in the summer and greater in cold climates than in hotclimates. In all cases the bitumen should be reduced to suchcopdsistency as to be somewhat plastic when co 0 indicates a flat metalband encircling the ends of the pipes and beneath the ends of which bandis placed a plate cl so that when the ends of the said band are securedthe a practically continuous band of metal. The ends of the band areeach turned or bent into tubular form as shown at 6 Figs. 2 and 3, andare secured together by any suitable means for example by means ofstaples f, f inserted in the ends of the tubular portions 6 as shown inFig. 1. The band 0 and plate d are preferably formed of mild steel. Forconvenience of manipulation of the metal band when making the joint Iuse wire loops or handles inserted in the ends e. Such handles areremoved prior to the application of the permanent fastening means. Whenabout to make the joint the band is coated with heated bitumen whichmaybe done by immersing it in a caldron containing the heated bitumenwhereby it receives a coating upon both its inner and outer surfaces.The inner surface of the band may have additional coats of bitumenapplied thereto. The band so treated is placed to the extent of one halfof its width under the end oftlie pipe, the other half of the width ofthe band projecting beyond the end of the pipe. The next pipe is thenplaced in position with its end abutting the end of the first pipe.Heated bitumen is poured on the top of the pipes and while ITO . larends e.

the bitumen is soft the plate at is laid thereon and pressed down and afurther quantity of bitumen may be poured over it. The band 0 is. thencaused to encircle the pipes, the ends of said band being drawn togetherby means of a suitable cramp which engages the tubu- In order to preventcollapse of the tubular ends e under the pressure neces sary to drawthem together, I may strengthen them by metal or other pins j occupyingthe middle portions of their length. When the band is drawn suilicientlytight, the staples f or other fastening means are applied to sesure theends together, and the cramp is then removed. The band should not be sostrong as to crush the pipes when the cramping pressure is exerted, butthe tubular ends 6 should rather be the first to give way by beginningto unroll, which is a good indication that the band is drawnsufficiently tight. Under the influence of the great pressure exerted bythe band the bitumen is forced well into the surface of the pipes sothat perfect cohesion between the pipes and bitumen is obtained and ajoint of great strength and tightness results. The pressure furtherprecludes the formation of air bubbles in the bitumen which would belikely to impair the efficiency of the joint.

In the case of pipes of large diameter I may use bands made in two ormore lengths, each pair of ends being drawn together and fastened asherein described, or some of the parts may be united by hinges.

The bands aforesaid add strength to a line of pipes at its weakestpoints. If desired one or more such bands lined with bitumen may beapplied to pipes or conduits of earthenware, cement or concrete atintermediate points, in order to still further strengthen the pipes orconduits against bursting pressure. In such cases the coating of bitumenshould only be thick enough to take up any inequalities in the surfaceof the pipes or conduits.

As aforesaid I may if desired employ a length of canvas or other textilematerial which is wrapped round the pipes at their 1 point of juncture,the subsequent operations incidental to the formation of the jointcylindrical abutting pipe ends, a flat metal.

band having eyes at its ends and extending nearly around said pipe ends,said band be ing coated with plastic bitumen, a plate also coated withplastic bitumen and extending between and beneath the ends of said band,and staples for uniting the eyes at the ends of the band after thelatter has been forcibly compressed around the pipe ends while thebitumen is plastic.

i 2. A pipe-joint comprising substantially cylindrical abuttingpipe-ends, a flat metal band having eyes at its ends and extendingnearly around said pipe-ends, a plate extending between and beneath theends of said band, a coating of bitumenon said band and plate, andstaples for uniting the eyes at the ends of said band.

3. A flat metal band having tubular eyes at its ends and'cores arrangedin the central parts only of said eyes, for the purpose specified.

4. A pipe-joint comprising substantially cylindrical abutting pipe-ends,a flat metal band, extending nearly around said pipeends, tubular eyesat the ends of said band. cores in the central parts only of said eyes,a plate extending between and beneath the ends of said bands, a coatingof bitumen on said band and plate, and staples for extending into theends of said eyes;

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ANDREW GEORGE BRANDRAM.

Witnesses:

E. T. STEWART, A. D. OAssELL.

